What Can You Build Without a Permit in New Mexico? (2026)
The 30-second answer for New Mexico
In New Mexico, the projects you can usually build without a building permit are a small detached shed, a short freestanding deck, a fence under the height cap, a low retaining wall, and cosmetic interior work. The exact limits New Mexico enforces are in the table below — and your city can be stricter than the state. The catch every homeowner needs to hear: even when no permit is required, the building code, zoning setbacks, and any HOA rules still apply. Permit-exempt means the paperwork is waived, not the rules.
How New Mexico sets the rules
New Mexico has a mandatory statewide residential code: the New Mexico Residential Building Code (14.7.3 NMAC), which adopts the 2021 International Residential Code with state amendments. It is administered and enforced by the Construction Industries Division (CID) of the NM Regulation and Licensing Department and became effective July 14, 2023 (work performed on or after December 14, 2023). Permit requirements and exemptions are set separately by 14.5.2 NMAC (effective March 10, 2022), the statewide minimum standard.
Permit-exempt limits in New Mexico
These are the thresholds we verified for New Mexico. Treat each one as the most you can usually do without pulling a permit — a stricter city amendment always wins.
| Project | New Mexico permit-exempt limit |
|---|---|
| Detached shed / accessory building | No building permit is needed for a one-story detached accessory structure (tool/storage shed, playhouse or similar use) if the floor area does not exceed 120 sq ft. New Mexico amends the IRC's 200 sq ft down to 120 sq ft (14.5.2.9 NMAC; mirrored by Albuquerque and Las Cruces). Anything over 120 sq ft needs a permit. Zoning setbacks, lot-coverage limits and HOA rules still apply, and accessory buildings can't be used as living space. |
| Deck | Follows the IRC baseline statewide: a deck is exempt only if it meets ALL of these — 200 sq ft or less, not more than 30 inches above grade at any point, not attached to the dwelling, and does not serve the required exit door (14.5.2.9 NMAC keeps IRC R105.2). Any attached, elevated, or larger deck requires a permit. |
| Fence | New Mexico's residential code DELETES the IRC 7-ft fence exemption (14.5.2.9 NMAC), so there is no statewide blanket fence-height exemption — it is left to your local building department. In Albuquerque, exterior fences and freestanding masonry walls up to 6 ft high above grade on the lowest side are exempt from a building permit; over 6 ft requires a permit plus NM-registered engineer or architect certification. Zoning height limits still apply. |
| Retaining wall | Stricter than the IRC 4-ft rule. Statewide, a retaining wall is permit-exempt only if it retains LESS than 36 inches of unbalanced fill AND has a total height of 6 feet or less measured from top of wall to bottom of footing; walls supporting a surcharge or impounding Class I, II or III-A liquids always need a permit (14.5.2.9 NMAC). Albuquerque applies a stricter local test — a permit is required once the finished-grade difference on opposite sides exceeds 24 inches. |
| Patio (on grade) | A ground-level (on-grade) patio slab generally needs no building permit. Sidewalks, driveways and platforms are exempt only if not more than 30 inches above grade, not over any basement or story below, and not part of an accessible route (14.5.2.9 NMAC / IRC R105.2). A patio COVER or roofed structure is a permitted structure. Zoning setbacks still apply. |
Baseline: 2021 International Residential Code, Section R105.2. See the national project-by-project guide for how each threshold works.
Can you do the work yourself in New Mexico?
Yes. Under New Mexico's homeowner's permit (14.5.2.18 NMAC), an owner may pull the permit and do the work — but only on their PRIMARY residence (not rental or other owned property). It requires a signed, notarized homeowner's permit responsibility sheet (affidavit), proof of ownership, and local zoning + floodplain approval, and the owner must self-perform the major portion of the work by dollar value. Only one homeowner permit per dwelling per 12 months. A homeowner may do their own electrical or plumbing only after passing a CID exam (75%); HVAC, natural gas and LP gas must be done by a licensed contractor.
What's different about New Mexico
Sheds are capped at 120 sq ft, not 200
New Mexico amends the IRC so the permit-free detached accessory building is 120 sq ft, not the IRC's 200. The 120 sq ft limit appears in the state rule (14.5.2.9 NMAC) and in Albuquerque and Las Cruces local codes, so a 12x16 (192 sq ft) shed that is exempt in many states requires a permit here.
The IRC's 7-ft fence exemption is deleted statewide
New Mexico's residential code strikes the IRC's blanket 7-ft fence exemption (14.5.2.9 NMAC), leaving fence permitting to each city. Albuquerque exempts fences and masonry walls up to 6 ft; over 6 ft needs a permit plus engineer or architect certification. Don't assume the common no-permit-under-6-7-ft rule without checking your city.
Homeowner permits are primary-residence-only and need a notarized affidavit
New Mexico lets owners self-permit, but only for their own primary residence, only one per dwelling per 12 months, and only with a signed and notarized homeowner responsibility sheet plus zoning and floodplain sign-off (14.5.2.18 NMAC). You must do the majority of the work yourself; HVAC and gas work always require a licensed contractor.
"Permit-exempt" does not mean rule-free
I spent 25 years as a firefighter before I built PermitDeck, so let me be blunt about the part that gets people hurt. "No permit" never means "no rules." When a project is exempt in New Mexico, three things are still true — and now you are the one responsible for them, because no inspector is coming to check:
- Building code still applies. An exempt deck in New Mexico still has to meet the structural rules of IRC R507 — real footings, a proper ledger, and guards. A shed still has to carry your local snow and wind load. The code does not care whether a permit was pulled.
- Zoning and setbacks still apply. Exempt does not mean you can put it anywhere. Setbacks from property lines, easements, lot-coverage caps, and corner-lot sight lines all still bind you — and a neighbor complaint can force you to move it.
- HOA rules are separate. Your HOA architectural review is a private contract, not a government permit. You can be fully permit-exempt with your city and still be forced by your HOA to tear something out.
The big New Mexico cities
Permits are pulled locally, so your city's building department has the final word. Here are the two largest, with a link straight to their office.
Albuquerque
City of Albuquerque Planning Department, Building Safety Division. Exempt work is listed in the city's Home Owner's Building Permit Guide: detached sheds up to 120 sq ft, fences/masonry walls up to 6 ft, platforms and walks up to 30 in above grade, and prefabricated above-ground pools under 54 in deep. Note fences under 6 ft may still need Zoning Counter approval.
Albuquerque building departmentLas Cruces
City of Las Cruces Community Development Department; apply through the Accela Citizen Portal. Las Cruces enforces the NM Residential Building Code, so the 120 sq ft detached-shed exemption applies; local permit exemptions are codified in Land Development Code Sec. 30-201, and fence/wall heights are also governed by zoning.
Las Cruces building departmentTurns out you do need a permit? We'll match you with pros who pull it
If your project crosses one of these New Mexicothresholds, the cleanest path is to hire a licensed pro who pulls the permit in their own name and stands behind the inspection. Tell us the project once and we'll send it to up to three verified local pros. It's free, it's capped at three, and we never sell your information — the opposite of the lead-farm sites.
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What happens if you needed a permit and skipped it
Guessing wrong on the exemption is not a small risk. The common outcomes are a stop-work order, a fine (often double the normal permit fee), and being ordered to open finished work back up for inspection or tear it out. The expensive part usually lands later: unpermitted work routinely kills a home saleat the buyer's inspection, and an insurance claim can be denied if the damage traces back to unpermitted construction. Most jurisdictions do allow a retroactive (after-the-fact) permit — it costs more, but it clears the record.
Full detail: what happens if you build without a permit and how to get a building permit.
New Mexico permit-exemption FAQs
Can I build a shed without a permit in New Mexico?
Yes, if the one-story detached shed is 120 square feet or less. New Mexico caps the permit-free size at 120 sq ft, lower than the IRC's 200 (14.5.2.9 NMAC), and larger sheds need a permit. Even an exempt shed must still meet local zoning setbacks, lot-coverage limits and any HOA rules, and it can't be used as living space.
Does New Mexico require a permit for a fence?
It depends on your city. New Mexico's residential code deletes the IRC's 7-foot fence exemption, so there is no statewide rule — each building department decides. Albuquerque exempts fences and freestanding masonry walls up to 6 feet on the lowest side; taller walls need a permit and an engineer's or architect's certification. Zoning height limits still apply everywhere.
Can a homeowner pull their own building permit in New Mexico?
Yes. New Mexico issues a homeowner's permit (14.5.2.18 NMAC) for your primary residence only, not rental or investment property. You sign a notarized responsibility affidavit, show proof of ownership, get zoning and floodplain approval, and must perform most of the work yourself. HVAC, natural gas and LP gas still require a licensed New Mexico contractor.
Do I need a permit for a deck or patio in New Mexico?
A deck is exempt only if it is 200 square feet or less, no more than 30 inches above grade, freestanding, and does not serve the required exit door — all four must be true (14.5.2.9 NMAC). Any attached or raised deck needs a permit. An on-grade patio slab usually does not, but a roofed patio cover does.
Sources we verified against
- NM Residential Building Code, 14.7.3 NMAC (adopts 2021 IRC; CID authority)
- NM CID Permits, 14.5.2 NMAC (exempt work 14.5.2.9; homeowner permit 14.5.2.18)
- N.M. Admin. Code 14.5.2.9 — Exceptions to requirement for permits (Cornell LII)
- City of Albuquerque Home Owner's Building Permit Guide (exempt work list)
- Las Cruces Land Development Code Sec. 30-201 — Exemptions from building permits
Every threshold on this page is anchored to New Mexico's building code or the sources listed above. Where a number varies by city and we could not verify it, we say "verify locally" rather than guess — a permit page you cannot trust is worse than no page at all.
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